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Finding the Fourth Proportional to 254.20, 381.87 and 219.61

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Solution

The fourth proportional to 254.20, 381.87 and 219.61 is: 329.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.20 : 381.87 = 219.61 : x
  2. Step 2: Convert to fraction form
    254.20/381.87 = 219.61/x
  3. Step 3: Cross multiply
    254.20x = 381.87 × 219.61
  4. Step 4: Simplify right side
    254.20x = 83,862.47
  5. Step 5: Solve for x
    x = 83,862.47/254.20
  6. Step 6: Final answer
    x = 329.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.